MP .227 -65 GN load data? Im having issues.

[bpatterson84]

Like the title says, I got this magnificent MP mold, made 2400 of the no lube groove no gas check model with clip on wheel weights, and hoped I'd find a happy AR load. Well, I simply didnt. For fun, I loaded some J word 55gr, and got sub MOA groups, so I know how to make a decent load, but after loading PC'd cast for 10 or so different rifle calibers at full power jacketed data, I'm quite perplexed. My groups were hilariously bad, I have yet to get worse than 3.5moa in other full power calibers, but at 50 yards, this group(??? hahaha) was unmeasurable it was so large. I was driving these pills at 2550-2700fps, and my first reaction is to say im driving waaaaay too fast. My first inclination is to reduce my load to 1800-2000fps, which I assume may have positive results. Anyone have any luck with this projectile? I'd sure love to hear good news, but if not, I'll just heavily reduce.

[sundog]

What is the twist?

[onelight]

When you shoot cast that fast you are in the realm of very advanced casting and loading , and every detail of the barrel , bullet fit , bullet selection , bullet alloy , coating , powder selection , loading technique and any other variable you can think of all have to work together , or at best bad groups at worst a damaged gun and or person .
I don't shoot cast that fast but hopefully the guys that do can help you figure out what to do with your 2400 bullets.

[sigep1764]

If you have a 1/7 twist, likely that is too fast. Mine are kept around 1900 using W748.

[WheelgunConvert]

My GC version flies well with 18.5 TAC or H4895 topped with a Dacron tuft. 7 twist barrel. PC seems to work a bit better than HiTek but not much.