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Topics - PA Valkyrie

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224 Valkyrie Photo Gallery / Finally, all finished!
« on: August 04, 2018, 04:29:21 PM »
Been working on this one for a couple of months.

Anderson Lower with Luth-AR parts kit, Timney AR Targa 2-stage, Acme Machine EZ take-down pins
Sanders side-charger billet upper, 24" 1:6.7 twist match-grade stainless bull barrel, air gauged and hand-lapped, Fat Comp muzzle brake, enhanced nitride BCG
Magpul PRS stock, JP H2 SCS buffer, Magpul MOE grip and foregrip, 20" Sanders M-Lok handguard
Acme Machine 6-24X50 FFP mil-dot scope, illuminated reticle, on Burris PEPR extended mount & 1/2" riser, Wheeler anti-cant level

Serious range testing on Monday!

224 Valkyrie Troubleshooting / Ejector swipes with factory ammo
« on: June 20, 2018, 03:36:27 PM »
I went to the range today and fired a box of Federal 70gr TMJ, a box of Federal 90gr SMK, and a box (20 rds) of handloads (77gr TMK over CFE223). When I was home punching out primers to save the brass, I noticed some pretty severe ejector swipe marks on about 10-12 of the factory brass. Unfortunately, I wasn’t checking for case issues at the range, so I don’t know WHICH factory load was the culprit. But I do know it was factory loads that had the swipe marks because the primers were factory-sealed with the blue lacquer. I’m suspecting the 90gr TMK’s because I shot a couple boxes of the 70gr TMK’s before with no problems. There were no flattened primers on the factory loads, although the handloads had flattening because they were loaded with CCI 400’s, which flatten if you sneeze on them. A couple primer swipes had enough of a burr to interfere with insertion into the shell holder on the press. Has anybody else seen this happening at all?

FYI, I have a Sanders 24” upper with a match-grade barrel, rifle-length gas system, non-adjustable gas block, and a compensator.

224 Valkyrie Reloading and Ammunition / Tight chamber issue
« on: June 03, 2018, 11:49:50 PM »
Is anybody else dealing with an extremely tight chamber in their Valkyrie? I am running a complete upper that I bought from Sanders Armory. It’s a 24” bull barrel. 416R stainless, 5R, air-gapped, hand-lapped, with a match-grade chamber. Sanders does not reveal the source of their barrels, but I am suspecting it is a Rock Creek. I’ve shot some factory ammo through it and it is “coming together”, but to realize full potential I am working up some handloads. Problem is, I haven’t been able to test any loads because up until this point none of my reloads would fully chamber and go into battery. I now have an RCBS AR-series small-base die set, which will size ammo that will chamber, but only if the die is set for just about maximum “cam-over”. Anything less will not chamber. I don’t like this situation because the powder capacity is lowered just a bit, enought to be problematic when using published data that is close to 100% load density. For instance, using the Sierra 77 TMK over RE-17, I can only get to the third data step without powder compression, even with using a long drop tube and a lot of tapping on the case. The upper load steps are unusable. The other issue is that small-base dies tend to work the brass excessively. Taking measurements I find that the maximum case dimensions that will chamber in my rifle are .003” less at the shoulder and .005” less at the base than that shown in the Sierra manual cartridge data. Anybody have any ideas on this?

New Member Introductions / Hello from the Keystone State
« on: June 01, 2018, 11:42:03 PM »
New .224 Valkyrie shooter in Eastern PA. Unfortunately limited to 300 yds (for now). Shooting a homebuilt on a High Standard lower, Luth-AR parts kit, Timney Targa two-stage, MagPul PRS & MOE grip, Sanders Armory 24” stainless match-grade upper and bolt kit, 20” M-Lok handguard, Vortex Viper 6.5-20. I just have 60 rounds through it so far, and I am beginning load development. Looking forward to get (and give) good info on this forum!

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