Tried both of the A-Square numbers and got a recording on each one. I'm doing good with my 100 count of brass. I was just letting any one interested in building a 338 Excalibur, that brass isn't a easy find. A 338 Sniptac has more case capacity than the Excalibur and cases are easier to find. You would have to build it on a custom action. I would build one(338 Snipetac) if the money was there, I'll settle for the Excalibur. The 200 fps you gain with the Snipetac will cost 2000.00 dollars or so. I was part of a 338-378 Weatherby Ackley build, and I shot it out to 2500 yards and kept it under MOA 5 shot groups. This is a bigger case and I have a 1 in 9 twist on the Excalibur, were I had a 1 in 10 twist on the 338-378. I hope to get out to 2750 yards with the Excalibur.
All of the savage 338 barrels have a 1 in 9 twist. Several barrel makers do a 1 in 9.3 twist. I've not shot the other barrels, but I feel this is helping quite a bit, more so for shooting way out there and alot of help with the 300 grainers.
Just asking here but why did you go with a 1-9tw when a 1-10tw seems to be fast enough for everything out there in .338cal ????
Probably have read this before, but Litz says the 1-10 will keep the Berger 300g Hybrid OTM stable out to 1 mile at standard conditions at sea level, so a 1-9 or 1-9.3 might be a better choice for more reach. Not sure on the RMBs.
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The reason I ask is because I'm assuming you're trying to shoot the "heavies" as fast or faster than something with a smaller sized case so why give up any FPS loss a 1-9 would yield when a 1-10tw will shoot to those distances and beyond with no loss of accuracy and mostly likely faster.
I've shot the 300 Bergers with the same load as the RMB and the Beger was 30 inch higher but not quite as good of grouping. I didn't change the sight in, just went out to 1000 and shot. Not sure if the Bergers had more fps or if it was all BC..
This is huge!! Did they shoot the same zero? 3 moa at 1000 is a lot to credit to BC. As for accuracy I would like to see if this holds true after several groups. At 1000 yards comparing groups should be with many of both especially if they are close. A little wind could be the difference.