BlueBoy69

Hmm, if you mean me by they the rather abusive term 'Keyboard Warrior', which I take it you do by the earlier "(This is turning into stalking directory)" comment, that's not a very nice thing to say. I am not a 'Keyboard Warrior' and I think the term you mean is 'Keyboard Jockey', which I'm not either. Whatever your ended meaning both are rude as I am just someone passing on information gleaned over almost a lifetime of being a shooter and who has been a worker in the defence or related industries for all of their working life? I know a lot about the subject, I write about it (small arms, ballistics, weapons technology, etc.) and related subjects every working day and often non-working days. I'm sorry if that may offend your sensibilities, but that's how it is. How about trying to be a little more non-abusive, non-critical and opinionated. As the the 6 mm ARC, it's essentially a 6 mm PPC with the shoulder blow forwards about 35 thousands of an inch to get a little more powder capacity. It seems a pokey round when loaded to bolt action pressure levels (60 kPSI), but its not too common and as such may be hard to get now and into the future. The 6 mm PPC family would provide very similar, but slightly lesser ballistics. My 'advice' to the original thread poster would be unless you want to fiddle around making cases, which I don't really like doing myself actually, just get something widely commercially available that fits the ballistics you require. If you want something more exotic, be aware of the caveats previously mentioned.

The 22 Grendel still seems to be a bit of a wildcat cartridge at present, so all the normal caveats will apply with its use. It seems to be relativity easy to make cases at least, well depending on the route taken to create them. Using the 6.5 Grendel case as the starting point and then directly or sequentially necking it down would seem to be the easier route. Certainly easier than going from a 7.62×39 case to 22 Grendel, which will take quite a few stages. Going from the 220 Russian is another option, which may be a simple fire forming job with potential neck turning. It may however be something a little more complex, but potentially not as hard as going via the 7.62×39 case route. Then also there's the option of using 22 PPC USA or 6 m PPC USA cases made by Norma to produce your 22 Grendel cases. The former similar to but potentially easier than the 220 Russian route, the latter a bit like the 6.5 Grendel option. In most if not all cases, annealing will need to be done at the end, or between case forming stages. This is a potential pain in the bum if you don't have a tool to do this. I guess it's all down to how much performance you want and how much hassle is involved in getting there. The 22 Grendel has got a bit more case capacity and hence performance than the next to identical case capacity and performance 22 PPC (22 PPC USA) and .224 Valkyrie cases, but the 22 BR matches, or trumps its performance by a small margin. For simplicity and even more performance you could just go with a 22-250 chambered rifle, but with a fast twist. Another option for simplicity, but accepting slightly less performance, you could just go with a 22 PPC or PPC USA, and for the latter you can still buy Norma cases; as I know personally.

For me the rifle produces one slightly larger than one bullet hole 10 shot groups at 25 yards in an enclosed (underground) range. At 100 yards between 1.0-2.0 inches depending on the weather and ammo available. Both of the above figures are roughly the same as my two previous .22LR sporting bolt actions. The accuracy is more than enough for me, as it's only really used for small game up to 100 yards. If I want to take longer shots I'll use my 22 or 6 mm PPC rifles, which are both bug hole shooters! I don't really know why you are so adamant that 22 semi-autos can't be both accurate and precise; mine is both? They aren't all cheaply built AR-15 or similar military look-a-likes by the way, though you seem to think they are for some reason only known unto yourself? Good quality semi-autos do not have to cost a bomb either, though mine was second hand and cost about £450 (see image).

I guess someone who thinks .22 LR semi-autos are inaccurate needs a go on my Rimfire Magic RM-22. It's at least as accurate as my previous sporting bolt actions, a SAKO Quad and a CZ 455. Unlike them however by the time you managed to fire a few rounds from either bolt action, the RM-22 can put all ten rounds in roughly one ragged hole at 25 yards. And that's 's not silly rapid fire it as fast as you can shooting, just fire, re-aim, fire, re-aim, etc., until the mag's empty. Obviously none of them were not as accurate as my old Anschütz Match 54, but that was a nice solidly made basic single-shot match rifle. As to the US AR-15 like 22 rimfire rifles, I've no experience with them as I'm not very keen on faux military rifles of any kind.

I've got some of them too. Quite a few actually.

The figures of 1 to 5 N·m (Newton metres) converts to about 8.9 to 44.3 lbf·in (pound-force inches, aka inch-pounds or pound-inches depending on your preference). Conversely 18 and 50 lbf·in respectively convert to 2.0 and 5.6 N·m. As such the Draper Expert tool set mentioned is just out of the required torque range. Personally I have a Wheeler Fat Wrench, which covers a 10-65 lbf·in (1.1 to 7.3 N·m) torque range, plus a load of other tools that were hangovers from being a cyclist.

PM sent.

Yes, as I said originally; either below or above if you want to scroll upwards.

Maybe I'm not understanding it correctly, but a primed case, which isn't for a firearm or ammunition you possess still sounds like an offence to me? The text, from Section 35 of the Violent Crime Reduction Act (link), is below. (4)It is an offence for a person to buy or to attempt to buy— (a)a primer to which this section applies, or (b)an empty cartridge case incorporating such a primer, unless he falls within subsection (5). (5)A person falls within this subsection if— (a)he is a registered firearms dealer; (b)he sells by way of any trade or business either primers or empty cartridge cases incorporating primers, or both; (c)he holds a certificate authorising him to possess a firearm of a relevant kind; (d)he holds a certificate authorising him to possess ammunition of a relevant kind; (e)he is a person in the service of Her Majesty who is entitled under subsection (6) to acquire a primer to which this section applies; (f)he is entitled, by virtue of the 1968 Act, the Firearms (Amendment) Act 1988 or any other enactment and otherwise than by virtue of being a person in the service of Her Majesty, to have possession, without a certificate, of a firearm of a relevant kind or of ammunition of a relevant kind; (g)he is in possession of a certificate authorising another person to have possession of such a firearm, or of such ammunition, and has that other person's authority to purchase the primer or empty cartridge case on his behalf; or (h)he is authorised by regulations made by the Secretary of State to purchase primers or cartridge cases of the type in question.

As far as I'm aware it's only assembled ammunition. Ammunition being classed as assembled as soon as a live primer is placed into a case. You can have all the components, just not any assembled (or simply primed) ammunition. Well until the law is changed.

1/4 MOA (15 seconds of arc) is approximately 0.0727 millradians. As such it would seem your scope may be set up in Strelok for 1/4 MOA clicks?

It would seem likely that it would be stable. The specs for the MME 220 gr BT bullets are: Overall Length: ≈1.414 inches (≈35.92 mm) Plastic Tip Length: 0.057 inches (≈1.44 mm) Weight: ≈220 grains (14.26 grams) You can use those details to plug into the various online stability calculators to do your own calculations. I don't have any ballistic drag data for it, but when I test some loads, I'll use the Labradar to get this information.

As far as I know it's 308 cartridge agnostic, though I'd imagine some smaller cartridges (30 Carbine, etc.) would have a problem using it 😄 I guess it's all down to if your rifle has a fast enough twist rate? The MME 220 gr BT bullet is about 1.414" (35.92 mm) long. So at subsonic speeds (lets say 1,070 fps), to be gyroscopically stable it will need a twist rate of about 1:11". Obviously that's a very crude estimation, but probably not too far off. When I enquired about heavy-weight 308 BT bullets, Pete Watson stated in an email that he could make any weight up to 250'ish grains.

I have a suppressed (a Wildcat Evolution) Remington Model 700 SPS Tactical AAC-SD in 300 AAC Blackout, its 5R barrel has a twist rate of 1:7". I normally use 165 grain H&N round nose copper-plated, plastic coated bullets loaded to subsonic velocity for plinking, but they are hard to get now. When fired from the suppressed rifle they make 'very' little noise. The firing report is more akin to an air-rifle than a firearm. The main noise heard is the bullet's impact with the target. I have a few other bullets to develop loads for, these can be seen in the attached image. Left is an NOE '311-232-FN PB AZ1' 235 grain plain-based cast lead bullet. The middle is a custom 220 grain ball-tip subsonic expander produced by Pete Watson of MME for me. The right an NOE '311-232-FN GC AZ1' 236 grain gas-checked cast lead bullet. The two lead bullets were cast and sized (to 0.309") by me. When they finally arrive, I've also got a job lot of 240 grain Sierra Match Kings to develop a load for too.

Sorry, I keep forgetting not everyone wants to reload! As stated by RobinC and seconded by Popsbengo, buy some preloaded commercial/MIL-Surp ammo that is known to work well in 1:7"-1:8" twist firearms. Try this ammo and if the groups are still pants, then the problem may be down to a sow's ear of a gun unfortunately. Can't help you with ammo selection as I don't have any firearms in 223 Remington, mine are mostly chambered for odd-ball calibres.