One on top of two Posted October 5, 2019 Report Share Posted October 5, 2019 Following on from the other night , I bought the GRS Bi- frost stock for my tikka T3 super varmint. ..... well I finally got out today before the rain set in I have to say I’m still very impressed with the aesthetics of the stock and personally think it compliments the whole set up in general , and did seem to be well received by my friends . But how does the thing shoot and with some new load development, well .... the following groups were shot at 100 m and 150 m in 3 and 4 shot groups. I only had 35 rounds made up so I had no choice but to limit my strings . load was with 77 TMKs lap brass FL BR2 primers RS 52 powder 20 thou from lands My T3 Rocks ! Quote Link to comment Share on other sites More sharing options...
leeroy Posted October 6, 2019 Report Share Posted October 6, 2019 Rifle looks really good, good groups too. I am trying to find out if they do one for a Sako 85 in 22-250 ,looks like a good buy👍 Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 6, 2019 Author Report Share Posted October 6, 2019 Yes they do them but mainly in the laminate I believe. 👍Here are the ones available for the sako 85 Quote Link to comment Share on other sites More sharing options...
Ronin Posted October 9, 2019 Report Share Posted October 9, 2019 Nice looking combination there and it certainly shoots well Quote Link to comment Share on other sites More sharing options...
ergid Posted October 13, 2019 Report Share Posted October 13, 2019 IT SHOOTS AS WELL AS IT LOOKS. Quote Link to comment Share on other sites More sharing options...
bighairyhaggishunter Posted October 23, 2019 Report Share Posted October 23, 2019 Impressive groups and set up....do the 77gr tmk ,s fit in the mag ok ?or are they single loaded? I'm thinking of upping from the 69 tmk cheers Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 23, 2019 Author Report Share Posted October 23, 2019 1 hour ago, bighairyhaggishunter said: Impressive groups and set up....do the 77gr tmk ,s fit in the mag ok ?or are they single loaded? I'm thinking of upping from the 69 tmk cheers thank you mate. no it’s all single shot for me. min this particular rifle I use a good fashioned bob sleigh 👍 Quote Link to comment Share on other sites More sharing options...
bighairyhaggishunter Posted October 23, 2019 Report Share Posted October 23, 2019 Many thanks and happy hunting😊 Quote Link to comment Share on other sites More sharing options...
markymark Posted October 23, 2019 Report Share Posted October 23, 2019 Out of interest what’s your load data for the 77 TMK’s Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 23, 2019 Author Report Share Posted October 23, 2019 3 hours ago, markymark said: Out of interest what’s your load data for the 77 TMK’s load was with 77 TMKs lap brass FL BR2 primers RS 52 powder 20 thou from lands Quote Link to comment Share on other sites More sharing options...
markymark Posted October 23, 2019 Report Share Posted October 23, 2019 Sorry to clarify, I was hoping for powder charge, velocity achieved and COAL (I know you’ve stated 20 thou from the lands). Thanks Quote Link to comment Share on other sites More sharing options...
Roy W Posted October 23, 2019 Report Share Posted October 23, 2019 I use 77TMKs, 24.5grains of RS52, out of an 18" barrel getting 2730fps with a COAL of 2.25" Mag length and can achieve similar results rested Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 23, 2019 Author Report Share Posted October 23, 2019 That’s not to shabby Roy 👍 I’m getting 2805 average FPS Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 23, 2019 Author Report Share Posted October 23, 2019 1 hour ago, markymark said: Sorry to clarify, I was hoping for powder charge, velocity achieved and COAL (I know you’ve stated 20 thou from the lands). Thanks Sorry ,,,, gimme two mins Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 23, 2019 Author Report Share Posted October 23, 2019 Right then .. 77 grn TMK RS52 = 24.4 grains ( weighed with sartorius Entris ) CCI BR4 primers Lapua brass full length sized and bumped back 3 thou to 1453 ( with my case comparator , yours will now doubt be different ) bullet seated to 1930 @ ogive giving an average of 2803 FPS / SD 5.1 Quote Link to comment Share on other sites More sharing options...
Roy W Posted October 24, 2019 Report Share Posted October 24, 2019 I also found TMKs very difficult to seat without leaving a ring around the Ogive. After researching it everywhere, getting a custom seating stem made by RCBS, trying chemical metal in my existing one and mulding it to the shape of the TMK, the rings still persisted. Eventually someone suggested neck tension was the issue, so I got a Redding neck Bushing die and full length size using the .247 neck bushing which gives about 1 thou neck tension. Problem solved, no more deformed TMKs. I then use a Lee Factory crimp die with a light crimp as they are used in an AR straightpull. Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 24, 2019 Author Report Share Posted October 24, 2019 1 hour ago, Roy W said: I also found TMKs very difficult to seat without leaving a ring around the Ogive. After researching it everywhere, getting a custom seating stem made by RCBS, trying chemical metal in my existing one and mulding it to the shape of the TMK, the rings still persisted. Eventually someone suggested neck tension was the issue, so I got a Redding neck Bushing die and full length size using the .247 neck bushing which gives about 1 thou neck tension. Problem solved, no more deformed TMKs. I then use a Lee Factory crimp die with a light crimp as they are used in an AR straightpull. I noticed the ring on the heads but soon sorted it with an easy fix the trick with the TNKs is to treat them like a VLD. You need a VLD bullet seat. If your using LEE dies they have a standard seat. I have found over the years anything with a plastic tip tends to seat similar to a VLD like I said it’s an easy fix Roy either way mate it’s not the end of the world. And it certainly doesn’t seem to be affecting your accuracy 👍👍 Quote Link to comment Share on other sites More sharing options...
Roy W Posted October 24, 2019 Report Share Posted October 24, 2019 I tried the VLD type stem which RCBS supplied, but I suspect it was the GGG brass I used being a little bit stiffer than other brands. The neck bushing solved it nicely, an doesn't have that annoying graunch as the ball expander pulls out of the case, so I am happy Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 24, 2019 Author Report Share Posted October 24, 2019 2 hours ago, Roy W said: I tried the VLD type stem which RCBS supplied, but I suspect it was the GGG brass I used being a little bit stiffer than other brands. The neck bushing solved it nicely, an doesn't have that annoying graunch as the ball expander pulls out of the case, so I am happy Nice one 👍 yes mate it is annoying for sure. I use Redding dies with the custom VLD seating. They sorted it. Quote Link to comment Share on other sites More sharing options...
markymark Posted October 24, 2019 Report Share Posted October 24, 2019 21 hours ago, One on top of two said: Right then .. 77 grn TMK RS52 = 24.4 grains ( weighed with sartorius Entris ) CCI BR4 primers Lapua brass full length sized and bumped back 3 thou to 1453 ( with my case comparator , yours will now doubt be different ) bullet seated to 1930 @ ogive giving an average of 2803 FPS / SD 5.1 Thank you. Near identical to my load with N140 in my Tikka. Good to know I can switch to RS62 without changing recipe. That said you get significantly better MV than me, so perhaps might be worthwhile to swap sooner rather than later. Quote Link to comment Share on other sites More sharing options...
One on top of two Posted October 24, 2019 Author Report Share Posted October 24, 2019 32 minutes ago, markymark said: Thank you. Near identical to my load with N140 in my Tikka. Good to know I can switch to RS62 without changing recipe. That said you get significantly better MV than me, so perhaps might be worthwhile to swap sooner rather than later. I’m using RS52 not 62 👍 Quote Link to comment Share on other sites More sharing options...
markymark Posted October 24, 2019 Report Share Posted October 24, 2019 That will be velocity explained then! Thank you, serves me right for skim reading. 👍 Quote Link to comment Share on other sites More sharing options...
TC Posted October 24, 2019 Report Share Posted October 24, 2019 11 hours ago, Roy W said: I tried the VLD type stem which RCBS supplied, but I suspect it was the GGG brass I used being a little bit stiffer than other brands. The neck bushing solved it nicely, an doesn't have that annoying graunch as the ball expander pulls out of the case, so I am happy Worth taking a look here. A bullet chucked in the drill and some autosol sorted it for me . https://sierrabulletsblog.com/2016/04/20/seating-concerns-with-sierra-tipped-matchking-tmk-bullets/amp/ Quote Link to comment Share on other sites More sharing options...
Roy W Posted October 24, 2019 Report Share Posted October 24, 2019 7 minutes ago, TC said: Worth taking a look here. A bullet chucked in the drill and some autosol sorted it for me . https://sierrabulletsblog.com/2016/04/20/seating-concerns-with-sierra-tipped-matchking-tmk-bullets/amp/ I tried that, still didn't work. Neck tension was my issue and no changing or polishing of stems changed the pressure needed to seat the bullet. I'll stick with my solution, it works and has done for 18 mths now. Quote Link to comment Share on other sites More sharing options...
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