vmax, how far off the lands??

[remingtonman_25_06]

Been shooting my browning a bolt 22-250 a little bit lately with some 55g vmax and H380 and W760 powder. Been getting .75" 3 shot groups from a bench at 100 yards with the better loads, on up to 1.5" or so for the not so good ones. I think if I tinker with my seating depth, I should be able to get it down to at least 1/2". Its been kinda windy lately, usually 10 mph crosswind, but it doesn't seem to have much effect on the good loads still.

I have found both nodes for each powder, so now I need to find the sweet spot for the seating depth. Anything above or below these charge weights and groups open up considerably. Right now, these are printing .6"-.8", with them all doing 2 in and 1 out.

With H380 my node is very short from 37.5g-37.8g and is around 3525fps.

With W760, my node is a bit longer from 37.9g-38.8g and again right at 3525-3550fps.

I am .010" off right now, but I am seeing somewhat of the typical 2 in 1 out, its not bad, but noticable. My OAL is 2.490" at the moment which puts me roughly .010" off. I started them at 2.5" which was at the lands, but back down to 2.490" shortly after I had a bullet get stuck.

So I guess my question is where do you guys set your vmax's typically off the lands to get them shooting the best??

I read an article on the VLD's saying to jump in .040" increments. I know the vmax is a totally different bullet but was thinking of doing something along those lines. I was thinking .040" at a time would be to much, but they say your rifle will defintaely show a preference for 1 of the lengths, then you could fine tune in .005 or .010" increments.

So I was thinking of going 2.450", 2.410", 2.370", and 2.350" which is the SAAMI oal with each of the 2 powders.

I think I'll concentrate around 37.5g of H380 and 38.5g of W760 and try those 4 different seating depths in groups of 3 next week and hopefully I can get it shooting dime size groups which I"m pretty sure its capable of doing.

Cases are fully prepped Winchester, weight sorted to within 1g, (out of 200 I got 100) trimmed, chamfered, debured, primer pockets cleaned, flash holes deburred, powder weighed on the dot every time. Am using Winchester Larger rifle primers. Did minimal testing with a few fed210's and my rifle definately showed a preference towards winchesters.

 

[Antelope_Sniper]

Remmy, that's very similar to the load I shoot in my 22-250.
Winchester cases
38.5gr W760
52gr sierra hp.
Winchester Mag primers.
I shoot this in a Rem 788, So I load to magazine length, and it's a short magazine. It shoots the lights out.

 

[matts318]

I know its 2 completely different bullets but the 110 30 cal v max in my 308, I couldnt load them anywhere near the lands because the bullet was so short but it shot good groups jumping it a lot. Out of my match barrel just for fun I had some old v max from my other gun (it was a starting load) and I put 3 downrange at 300 yards just to see what would happen and I put them in a 1.5" group. At least in the 30 cal they liked a lot of jump, I have some 55gr for the 22-250, I will have to try them out.

 

[Guest]

until it shoots well in yer rifle.