75 gr Amax

[Hoier]

I made the mistake of weighing a couple of these, then thinking my results were kinda funny so I just weighed them all and I got a difference of .9 gr which I thought was alot and I was wondering what kind of difference is acceptable. Thanks in advance

 

[40X Guy]

Fantastic bullet! I too have weight sorted mine and they can be off, I get weights anywhere from 74.7 to 75.4. I also sort by bearing surface and store them in the Walmart plastic sewing organizers.

Frank

 

[m-saunoras]

i always sort by bearing length but have never weight sorted. I'm going to have to try that because they don't shoot as good as i like in my 22-250

 

[Hoier]

I was getting anywhere from 74.3 to 75.2 which I thought was ridiculous.

 

[Geronimo Jim]

I worked up some great loads with the 75 grain A-max in my 22 BR. So I bought 500. New batch would not shoot. Original old box of 100 would stay in the 2's and low 3's and the new bullets .8 to 1 inch. Thought my scope went south, took gun back to gunsmith......then tried some Sierra bullets and they shot like a champ. Called Hornady....said send a sample back to them to test. That was about two months ago and haven't heard anything. Guess I should call. Anybody want to buy 400?

 

[ed k]

I tried some of the a-max in my new savage with 1-9 twist. At 200 yards it was about 10 inch groups. Loaded up some 55 hpbt sierras and shot sub 1 inch group. any ideas? i thought this twist would stabilize the 75 grainers. ED K

 

[15Tango]

Ed, how fast are you running them? If you're not running them that fast they'll probably stabilize better if you have room to make them go faster. If it's not a stability issue try changing seating depth. Are you jumping or jamming?

Wayne

 

[ronemus]

The A-Max is too long to stabilize properly in a 1:9 barrel (you might get away with it on a hot day and/or at high altitude). They were marginal in a 1:7.7 for me, and I now use 1:7 with good results. With a 1:9 your best bet is the 75 gr BTHP; it's a great bullet to 800+ yards, but won't be supersonic at 1000.

 

[15Tango]

1:9 won't stabilize a 75 Amax . . . I'll have to let my 1:9 rifle know it's not supposed to shoot those 75 Amaxes sub-MOA at 600 yards.

 

[ed k]

I don't know velocity but i loaded 29-30-31 grains of varget and they all were huge groups so i just gave up on them. I was jammed to lands but the groups were so big i didn't think that was a problem. ED

 

[FroggyOne2]

I use a 30" 7.2 twist BBL.. and they are a tack driver in my .223.. last time out with it.. I shot a 195-8X and a 192-6X at 1000 yards and then the next day shot a 198-10X 197-3X (switched to irons) and then again with irons shot a 199-11X at 600 yards.. I have been very pleased with them! My load is 24.0 grs of H4895 in Lapua brass.

 

[Taildrag15X]

I don't know velocity but i loaded 29-30-31 grains of varget and they all were huge groups so i just gave up on them. I was jammed to lands but the groups were so big i didn't think that was a problem. ED

I think your a little hot on the loading....Hornady calls for 25.3 I think as max for .223 Rem.

I run these out of a 1-9" twist Savage 112BT, .015 off, 24.85grs. (+ or - .02) Varget, weight sorted from 2,000 lot I bought so that I could end up with 100 bullet lots to shoot 60 & 80 shot courses with. I have cleaned targets with them in this this rifle and in a newer Model 10, even the 77gr. Sierra MK's seem to work out of 1-9".

I have used them also in a 1-7", 28" Krieger at 600 yds. F-Class and came home the VT State F/TR Champion.

Don't give up on them too fast cause the weights are all over, I've found it true with most Hornady's, even the 6mm 105's.

 

[Laurie]

Posted by: 15Tango
1:9 won't stabilize a 75 Amax . . . I'll have to let my 1:9 rifle know it's not supposed to shoot those 75 Amaxes sub-MOA at 600 yards.

The 75 A-Max Sg (stability factor) is 1.15 in standard ballistic temperature and pressure conditions at 3,000 fps from a 1-9" twist barrel. So, it's theoretically stable, but only just.

When the Sg value is marginal as in this case, seasonal variations or even day to day changes in ambient conditions can move it in or out of the performance envelope. More importantly, when people quote twist rates for their barrels, that will be right to a couple of decimal places if it's a Bartlein, but might be plus or minus 1-0.25 in a factory rifle where the twist rates quoted by manufacturers are nominal, not necessarily precise. Also depending on the barrel rifling process used, there may be marginal variations in twist rate within the rifling that destabilises an otherwise marginally stabilised bullet.

So, this bullet may shoot really well in a .223 Rem Remington 700 Police say, but not in a Savage 12 LRPV - or vice versa. Even in custom built rifles with true 1-9" twist barrels, it may shoot well in one and not at all in another. The only way to know for sure is to try it, or better still get a 1-8" or faster twist barrel, where you know for certain that any grouping problem is not down to twist rate.

 

[ed k]

taidrag- i'm shooting 22-250 so thats where the difference is. My fifle is factory 12 savage with 1-9 twist. I'll back of the lands some and try but i also picked up some 69 sierra match bullets. I've never had sierras of any caliber shoot poorly. some bullets and guns just dont go together and this is problably my thing here. ED