Hunting Washington Forum

Equipment & Gear => Guns and Ammo => Topic started by: zwickeyman on December 12, 2020, 09:41:00 AM

Title: Reloading question for the Guruhs
Post by: zwickeyman on December 12, 2020, 09:41:00 AM: If I have a twist rate that is too fast for the bullet I am using. Do or can I use slower or faster burn rate powder to help compensate

Thanks in advance
Title: Re: Reloading question for the Guruhs
Post by: hunter399 on December 12, 2020, 10:08:33 AM: I've had it happen a few times where bullet didn't stabilize and was tumbling and hitting target sideways and stuff.
Which was in 243 ,but shooting same loads in two different rifles ,one rifle shot fine,other they tumbled.But I just changed bullets for the one rifle.
But by all means I'm no expert.
Sure someone that know more will chime in.
Title: Re: Reloading question for the Guruhs
Post by: b23 on December 12, 2020, 10:36:19 AM: Quote from: zwickeyman on December 12, 2020, 09:41:00 AM
If I have a twist rate that is too fast for the bullet I am using. Do or can I use slower or faster burn rate powder to help compensate

Thanks in advance

One really has nothing to do with the other so I'd say no.

When you say "help compensate" what exactly do you mean by that, are you getting or worried about bullet failure due to over spinning the bullet? I suppose maybe in that sense you could use a different powder to drastically lower velocity which lowers bullet RPM but if you aren't getting bullet failure what are you concerned about?

And just to be clear, the way you ask the question your barrel has a much faster twist rate than what the bullets you plan to shoot require, correct?
Title: Re: Reloading question for the Guruhs
Post by: TooTallMike on December 12, 2020, 10:38:33 AM: Quote from: zwickeyman on December 12, 2020, 09:41:00 AM
If I have a twist rate that is too fast for the bullet I am using. Do or can I use slower or faster burn rate powder to help compensate

Thanks in advance

In your opinion how fast is too fast? Are jackets separating and your bullets going Poof? I'd love to hear the setup you got to see what's going on. But I don't believe changing powders will make that much of a difference unless you're changing the amount to significantly reduce velocity IF you indeed have too fast of a twist. In that case you'd have to switch bullets to a longer one which typically means heavier.
Title: Re: Reloading question for the Guruhs
Post by: TooTallMike on December 12, 2020, 10:40:51 AM: Btw to calculate RPM it's

Velocityx720/ twist rate.

General rule of thumb is to not go over 300k RPMS
<275K is better.
Title: Re: Reloading question for the Guruhs
Post by: buckfvr on December 12, 2020, 11:49:56 AM: Im curious about caliber, bullet weight, barrels twist, bullet mfgs recommended twist rate etc. Once you compromise one thing, there will be other compromises introduced as you cant address one element with out it affecting another.
Title: Re: Reloading question for the Guruhs
Post by: jakeweb on December 12, 2020, 02:04:02 PM: Unless you’re spinning the bullets jacket off it shouldn’t be a problem. I don’t think you can really overstablize a bullet. Most people have the opposite problem of not enough twist for the bullet they want to shoot. But different powders will not help. New bullet or new barrel!
Title: Re: Reloading question for the Guruhs
Post by: zwickeyman on December 12, 2020, 03:41:11 PM: Thanks for all the replies

I should have given more info

I am loading for a 6.5 PRC with Rl26 and various 140 gr bullets. My barrel is 1:7 twist. So far my groups havnt been great but havent tried all bullets yet. I was headed to 3 forks today for stuff and thought after looking at the burn rate chart that a slower or faster burn rate might make as much difference as a lighter or heavier bullet does with twist rate
Title: Re: Reloading question for the Guruhs
Post by: buckfvr on December 12, 2020, 03:55:36 PM: 7 twist in that caliber is certainly for the heavier/est bullets for that caliber, however you shouldnt see any problems 140gr and above, probably not even 130gr.
Title: Re: Reloading question for the Guruhs
Post by: Reidus on December 13, 2020, 09:53:43 AM: Higher velocity will cause the bullet to spin faster and less velocity will cause it to spin slower, regardless of type of powder. When a bullet is not perfect it will tend to wobble and cause a loss in accuracy if overspun. Like an unbalanced car tire, at certain speed it will begin to wobble. For the most it's not a big deal to over spin bullets. The only real way to know is to try it.
Title: Re: Reloading question for the Guruhs
Post by: hogslayer on December 13, 2020, 01:09:20 PM: Since a 1:8 is ideal for 140’s. A 1:7 is not going to be noticeable. Will actually give you a slightly higher BC. I have a 300 wsm that is 1:9 and shoots 200’s great. Suggests (1:11). A 7 wsm that is a 1:8.5 and shoots 168 awesome. (1:11) suggested. Did the math and I was still at around 230,900 rpm. H1000, 7977,N565, RL26 would be my first powders to try. RL23 or H4831sc would also work well
Title: Re: Reloading question for the Guruhs
Post by: buckfvr on December 13, 2020, 01:19:35 PM: What 168gr .284 recommends an 11 twist ???
Title: Re: Reloading question for the Guruhs
Post by: hogslayer on December 13, 2020, 05:04:17 PM: Good catch. The 168 vld Berger is 1:10.
Title: Re: Reloading question for the Guruhs
Post by: zwickeyman on December 15, 2020, 08:45:37 PM: Just acquired 250 ct of 140 gr Accubonds :IBCOOL:
Title: Re: Reloading question for the Guruhs
Post by: TooTallMike on December 15, 2020, 09:03:35 PM: Quote from: zwickeyman on December 15, 2020, 08:45:37 PM
Just acquired 250 ct of 140 gr Accubonds :IBCOOL:

Congrats! Please keep us posted with your progress and ask away !
Title: Re: Reloading question for the Guruhs
Post by: birddogdad on December 16, 2020, 06:59:30 AM: Quote from: zwickeyman on December 12, 2020, 09:41:00 AM
If I have a twist rate that is too fast for the bullet I am using. Do or can I use slower or faster burn rate powder to help compensate

Thanks in advance

? change bullets
Title: Re: Reloading question for the Guruhs
Post by: zwickeyman on December 16, 2020, 09:43:03 AM: Quote from: birddogdad on December 16, 2020, 06:59:30 AM
Quote from: zwickeyman on December 12, 2020, 09:41:00 AM
If I have a twist rate that is too fast for the bullet I am using. Do or can I use slower or faster burn rate powder to help compensate

Thanks in advance

? change bullets

I understand. I have 2 other bullets I have loaded for ladder tests. Then I will switch powders. Just had a question about about burn rates in relation to barrel twist. I reload for all my rifles and all shoot great. It was just a question about burn rate and barrel twist. I probably could have phrased it better
Title: Re: Reloading question for the Guruhs
Post by: Fl0und3rz on December 16, 2020, 10:26:06 AM: I would think that you would "shoot" for lower velocity, which may mean using a powder that still fills the case sufficiently while providing that lower velocity. I don't know if that translates to the lower velocity powder selection being a slower or faster burning rate powder, necessarily, however.