80gr gmx 243 load?

[demontang]

Anyone played with the 80gr gmx yet? Got some coming and I'm thinking of using some h414 or imr4064.

[high country]

I have used 414 with lighter bullets, it would be on the edge of too fast with a 80 gr.....could go either way. I get good velocity out of the 4831 with 85gr tsx. I tried varget too but could not get close to speed without overdosing.

[demontang]

Well I got the bullets now to start working up a load, they look long for a 80gr I hope they shoot well.

[demontang]

Well finally got some loaded up and made it to the range. I started at 43.5grs of h414 and let's say it wasn't a pretty group at 9" next was 44gr and the group shrank to 7-8". The 44.5 and the group came in more to about 4". I was starting to doubt these shooting well. I loaded up max load of 45grs and tried it. I was shocked the group jumped to .75"!! No signs of pressure at all too. I thought about going up more but figured it was good with .75" group. I'll hunt the range again and really try to see how good it will shoot of a better rest.

[BULLBLASTER]

thats pretty good, crazy what a grain or two of powder will do to groups.

what kind of rifle is it that you are using?

[257 Wby Mag]

Did you shoot em over a chrony demon? Got some 80 TTSX's to load in my 243. Later

[demontang]

No crono yet but next year I'll have one. I have a mossberg 100atr. The thing is basically a savage and shots very well, it's light short and quick to point for coyotes.

[257 Wby Mag]

Right on. Maybe I'll load some up and tell ya how fast they're goin'. grin... Mines kind of a general purpose meat axe, model 660 rem with a 18 1/2'' snout. Maybe I'll load some up this week. Later

[demontang]

I think I have a 20" barrel. And getting a gen velocity would help with the ballistics calculation. I'm thinking it's around 3200