Thread: 7mm08 loads 150 - 168gr

Just went and picked some more up, will try both 2208 and 2209 on friday. Then Abe can let me pillage his chrony next week and see whats doing comparatively better velocity.

Chris

Shit.

44.5 is actually below book minimum load. I started at 45.0 and worked up to 47.0.

Not one load of amax stayed at the seating depth, they all pushed back out from 3 to 15 thou (but very even within each load).

The barnes are staying put. I don't have much confidence in the 2209, maybe if I had an extended mag box. Will see on friday.

Chris

I haven't retested this yet but 47gr AR2209 gave 2644fps avg 22" barrel and .5" 3 shot group with a just touch load too long to fit the mag though at 2.975"

Originally Posted by crnkin

Shit.

44.5 is actually below book minimum load. I started at 45.0 and worked up to 47.0.

Not one load of amax stayed at the seating depth, they all pushed back out from 3 to 15 thou (but very even within each load).

The barnes are staying put. I don't have much confidence in the 2209, maybe if I had an extended mag box. Will see on friday.

Chris

My Nick Harvey book starts at 43gr 2209 with 162gr

41gr 2208 with 162s gave 2500 from 19" barrel, I get 2840 with 44.3 gr 2208 from. Looking at figures I should be able to achieve 2600 with a little more powder....

Got some results from friday.

2209 definitely had less accuracy than 2208 with the 162's, presumably because they were so bloody compressed. Shooting just over an inch compared to just under half with 2208. Could work with it at different seating depths, but time better spent armed tramping.

However the 150g TTSX boat tails seemed to shoot ok with the 2209, at both 45.5g and 47.0g, seated to fit well inside the mag.

Primers look nice and cratered on the 47.0, slight ejector mark, can just detect case head expansion of .001 with shitty calipers





Chris

Yeah they are CCI 250's though, thought they were pretty hard?

47gr 2209? what speed were they doing? thats quite a long way below max charge, be the first time I've heard of pressure below a max adi suggestion lol

Its because the bullets are seated so deep, they are solids, and lapua brass.

I dont really care too much about the speed (don't have a chrony), as long as the accuracy is ok. 45.5 should be ok I think

Chris

Originally Posted by crnkin

Its because the bullets are seated so deep, they are solids, and lapua brass.

I dont really care too much about the speed (don't have a chrony), as long as the accuracy is ok. 45.5 should be ok I think

Chris

Generally wee chris seating deeper creates "less" pressure...
And lapua brass should deal with more pressure...

Theres probably something else going on thats not quite right!
Such as excessive neck tension or seeing as you necked down that brass your neck might be squishing in the throat or there may be abit of crap in there causing it to squish..
A good scrub in the troat area and maybe a neck turn could make all the difference...

Also id assume 2209 abit fast for a 162 in a wee 308 sized case maybe try some 2213SC or summin abit slower than that even N165???... The fact that your filling the case before book max and probably getting slow speeds and pressure early says alot for your powder cjoice

Ive loaded very heavily compressed deep seated loads to well about what your loading and that was necked down 308 brass hence the question, thought if the speeds were up it might help work out what the cause is (just interested as Ive never seen pressure in a load that low before)

What sort of OAL are you guys loading the 162 to in 7-08? I've got a Browning to load for and the mag is really short inside, I think it allows 2.7 only, 139 SST was too long for it and wouldn't shoot, too much jump. It's that stupid floor plate + detach mag system. Might have to go to 120gr BT to get them to fit, then BC is appalling

Ffff

Stupid browning. Need to get a bottom metal kit for it that uses AI mags or something.

Argh.


I imagine 2217 was a failed experiment in reaching Internet speeds in .25-06, "back in the day"

Don't expect too much as far as length in the AI mags Gimp.

The AICS ones have spacers. No? Which can be removed, giving 2.9" internal, from memory