20 Cal's

[col48]

well lads I'm thinking of building a new rifle for my self,and the 20 cal keeps rearing its ugly head.

now i know nothing about this round and was after some opinions.

the rifle would have to be a foxing rifle and corvids and i would like to stretch its legs out to 600y and buck the wind.

i was thinking of sticking it in a 6.5x47 lapua case, do you think this will be to much case,

any way lets here from the ones in the know

it will be in a sako 75 action and a MC stock

ATB

Colin

[Guest northernchris]

Col

 

20Br would be a good way to go,it will easy run to 600 yrds,i would have thought the 6.5 x 47 case would make it very overbored/very unefficient.

[20ppc]

Hi Col,

 

The first thing you have to decide is what weight bullet you want to use, then you will be in a better position to decide on which parent case to go for. As always it will be a compromise!!.

 

All the best,

 

Nick.

[col48]

Hi Col,

 

The first thing you have to decide is what weight bullet you want to use, then you will be in a better position to decide on which parent case to go for. As always it will be a compromise!!.

 

All the best,

 

Nick.

 

I'm thinking 50g burger say 9 twist,

 

ATB

Colin

[Alycidon]

Hi Col,

 

The first thing you have to decide is what weight bullet you want to use, then you will be in a better position to decide on which parent case to go for. As always it will be a compromise!!.

 

 

 

Agree with that 100%.

 

600 yards will be top wack for 39/40 grain pills in a BR case generally on a 1 in 10 or 11 twist. The 50 Berger in the BR case will stretch that to around 800 yards. (Todd Kindlers figures not mine!). Berger are about to launch a 55gr pill, dont really know why as a 60 grainer would have been a better idea for the bigger 20 cases.

 

Dont know anyone who has done a 20 x 47, the boys on Saubier and 6BR are currently talking about a 20 Dasher unless that is it. I thought Dasher was a blown out BR case with a 40 degree shoulder. One of the delights of the 20 is seeing the impact, once you get to 35 grains of powder this may be difficult unless you build a heavy rifle.

 

Todd believes that the BR case and a heavy bullet ( 50 to 60 gr ) are about the optimum choice in 20 cal. He specifically advised against altering the shoulder angle, shame as I think the Ackley rounds look much more purposefull!. Twist is a 1 in 9 for the 50, you might want a shade faster for the 55. This twist will also shoot the lighter bullets well. From a 26" barrel with the 50 gr you should get close to 3700 fps but you will need a bit more barrel to get to 3800 I think, maybe 28 inches.

 

I seem to remember that last year Bruce Potts did a 20-243, there was a feature on it in the press, (20 Satan ?). I would think that should shift the 50 at 4000 fps but I doubt the shooter would see much. There is also a lad here with a 20.250 that will have some good input as will Dasherman.

 

Why are you going Sako and not Lawton etc, a rebarrel job ?. Mine is still in the build by the way.

 

A

[Vermincinerator]

Col,

Save yourself a lot of grief mate and choose one of the established 20 cals, the best of which is IMO the .20BR

A .20-6.5x47 will be nearly identical to the .20-250 which is a very specialised cartridge and could be more hassle then its worth but if thats what you REALLY want then go for it

 

Ian.

[ds1]

Col,

 

Bruce potts would be a good place to start for info on the 20 and 22 x 47 cases. I think in 2004 he developed a 20x47SM (Swiss Match) that worked with 50 grain bergers - 20 Satan, later to be chambered in 22 Satan also.

 

Swiss Match cases were used before lapua 6.5x47 came along - SM offers a longer neck and thinner brass, Lapua - a shorter neck, more capacity and small primer. Dave Kiff made (has) reamers for both versions from what I have read from Mr. Potts.

 

I can not rember the performance of 20 Satan, but as 22 Satan is getting over 3000fps with 90 grain pills I suspect 20 cal would be fast, flat and overbore.

 

The concept was to have a 20 cal barrel, 22 cal barrel and parent case cal as a switch barrel - from what I`ve read Mr. Potts did it on a RPA action with Lazeroni stock. no reason similar could not be done on a Sako action - seems a neat concept 6.5x47 one barrel and addition barrels in 6mm, 22 and 20 cal. Take your pick.

 

 

David.

[20ppc]

Col,

 

If you want to shoot 50gr bullets you are best sticking to a 20br or if you want a 20dasher with a 1in9 barrel. Forget the Satan as it is overbore for anything less than a 60gr. I have just spoken to Bruce Potts who has stopped using his until he can get some 60's. Steve Bowers built has built a second Satan for another customer but that barrel was shot out after just 800 rounds using 40gr bullets.

 

Nick

[col48]

Col,

 

If you want to shoot 50gr bullets you are best sticking to a 20br or if you want a 20dasher with a 1in9 barrel. Forget the Satan as it is overbore for anything less than a 60gr. I have just spoken to Bruce Potts who has stopped using his until he can get some 60's. Steve Bowers built has built a second Satan for another customer but that barrel was shot out after just 800 rounds using 40gr bullets.

 

Nick

 

 

hi nick

 

i have just spoke to a chap on 6mm BR and he has the chambering,and he pushed it hard and got 750 round count.so this holds true to what Bruce has just said.

 

ATB

Colin

[col48]

Col,

 

Bruce potts would be a good place to start for info on the 20 and 22 x 47 cases. I think in 2004 he developed a 20x47SM (Swiss Match) that worked with 50 grain bergers - 20 Satan, later to be chambered in 22 Satan also.

 

Swiss Match cases were used before lapua 6.5x47 came along - SM offers a longer neck and thinner brass, Lapua - a shorter neck, more capacity and small primer. Dave Kiff made (has) reamers for both versions from what I have read from Mr. Potts.

 

I can not rember the performance of 20 Satan, but as 22 Satan is getting over 3000fps with 90 grain pills I suspect 20 cal would be fast, flat and overbore.

 

The concept was to have a 20 cal barrel, 22 cal barrel and parent case cal as a switch barrel - from what I`ve read Mr. Potts did it on a RPA action with Lazeroni stock. no reason similar could not be done on a Sako action - seems a neat concept 6.5x47 one barrel and addition barrels in 6mm, 22 and 20 cal. Take your pick.

 

 

David.

 

hi dsc1 (Dave)

 

i spoke to Bruce last year on the project,and he sent me all the articles he had wrote on them, one thing that stood out was the lack of a comment on barrel life.

as i recall there was no mention of it.(well none i saw or recall)

but it did spark a bit of an idea,

 

ATB

Colin

[col48]

Why are you going Sako and not Lawton etc, a rebarrel job ?. Mine is still in the build by the way.

 

A

 

hi geoff

 

i am going off custom actions, and tending to lean towards the sako 75,

1 they are a good action to start with

2 the box mag and bottom metal are as good as anything out there.

3 no messing around with the USA import and the that which promotes growth and vigour that goes with it.

 

i might just sell my nesika,s and build myself some sakos,(until i get feed up with them ) and then import some custom actions

 

ATB

Colin

[Alycidon]

The Sako 75 is a good action no doubt, be interesting to see how you get on.

 

A