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Messages - bob_atl

258
Reloading / Re: QL+OBT
Thanks  jvw, hadn't thought about speed-up due to more pressure from a can..
Was thinking more along the lines of a can or muzzle device having the effect of lengthening the barrel for harmonic period calculations.  Either way its a change from the norm of what the simulation is working with.
Probably over-thinking this (again).
259
Reloading / Re: QL+OBT
Yah DJ tks, I can see a bull barrel not being affected much.
Just don't have any bull-barrels !!
Will need to do some range-work on my stuff to see how close QL+OBT can put a pill on a node..  (no skip'n that step)
260
Reloading / QL+OBT
Been pestering Jerry with QL * OBT questions,, he's been patient & very helpful in my learning curve with these.
TKS jvw.

I am asking if heavy muzzle breaks and cans have been seen to alter OBTs on bolt guns ?
Also, do gas guns with various gas port lengths,  also follow the posted OBT values ?

TIA, Bob
261
General Discussion / Re: Magnetospeed sporter reading slow.
Mine was a nearly perfect match to the old optical style it has replaced.
One set of readings, one day, appeared low imo.
Tried to narrow it down, thinking maybe the muzzle break was affecting the first sensor.
But after several before/after trials, the muzzle break made no difference.
Don't think a low battery can cause it, maybe the wand being marginal or too far from the bullet path could do it, just don't know.
My 6.5 CM 400 yard strelok pro ballistics revers-eng fps trend higher than magnetospeed, fps by approx 20 fps, fwiw..
But there are a some questionable  factors at play there also, like true  BC, WX input, etc.
262
Reloading / Re: 123gr vs 140 gr
....I see so many people (not necessarily here) seem to be n love with the 140 gr bullets...

Welcome Darrell , I'm also kinda new here.

It could be a simple anomaly  that those reporting a preference just happen to have an unusual distribution of barrels that like the heavier pills, not so much a choice based on characteristic of pill parameters.
My RAP creedmor falls into that category of preferring the heavier pills, its a 1:9  1:8 twist.  (tks CTF)
263
Ammunition / Re: Hornady ELD-X Factory ammunition - good results
..  Now I just need to get it chrono'd, and I'll be good to go...
Its my factory choice for hunting in a 22" RAP.
Clocked them at 2603 fps while breaking in the RAP, might go a few fps more now.
They were as accurate as  factory ELD-Ms, which are hard to beat with handloads in my RAP.
The 400 yards drop matched by Strelok Pro was 2680 fps, for this same round, fwiw..
265
AR Variants / Re: ar 15
(for case dents) Put some Velcro on the upper deflector, and if the extractor is digging into the the rim, then the corners of the extractor claw need to be rounded.  Been there, done that.  I now round all extractor claws before they go shooting.. as insurance.
Before both mods above.

269
Gunsmithing / Re: GETTING STIFFER! ;o) (My RAP plastic stock, that is)
I'm going nuts trying to decide if I want to do the boydes or just keep tweaking the factory stock. ..
For the money involved with switching to the boydes .....
Went through same question, decided to leave the hunting 243 RAP in plastic but put a boyds on the range bound creedmoor RAP.
Bedding the boyds blocks was easy, waiting on the metal trigger guard.
Worth it to me for range work to go the boyds route and still not that expensive.
270
AR Variants / Re: My first AR/ my 1st post
Quote from: Johnnyblaster
......Never built a gun before so hopefully all goes well ;)
pic worked fine, but be aware building evil black guns is addictive (but so much fun!)