Convertible Blackhawks and Thunderer owners, a question

[Antihero]

I was considering getting a CarryHawk , Blackhawk or a Thunderer in 45 Colt/45acp but o worried about it not shooting point of aim on both, a quick search says I was right to be worried.

Anyone with first hand experience?

 

[Ohen Cepel]

It will take some effort to find loads that may shoot to POI for both. I don't see that as a show stopper though. I get it backwards but I think its lighter/faster to move it up on the target.

So, get the main one you want to use sighted in with your load and see where the secondary one hits. Then, adjust those loads till it is hitting the same POA.

Physics pretty much assures you that they won't both hit at the same POA unless you have loaded both calibers the same, which is a solution.

 

[Tallball]

I have a 357/9mm Blackhawk "convertible", and the 9mm's do have a slightly different POI.

I also have a 45colt/45acp Blackhawk, and the POI is similar enough to not really matter to someone with my modest shooting skills.

Ruger Blackhawk 45 Convertible

• Tallball
• Apr 20, 2020

 

[gotboostvr]

They'll be pretty close if you regulate it for similar weight bullets.

115gr 9mm and 158gr 38's will hit pretty different.

Same with 180gr 45acp and 300gr 45colt

You might be able to get away with 147gr 9mm and 158gr 357's or 230gr 45acp and 250gr 45colt.

 

[Antihero]

Close is fine, I just wanna make sure it isn't ridiculous.

I've read a 12 inch drop at 15 feet between loads......that's pretty much useless

 

[Crosshair]

Close is fine, I just wanna make sure it isn't ridiculous.

I've read a 12 inch drop at 15 feet between loads......that's pretty much useless

Nope. Nothing like that.

With my 357/9mm convertable the 9mm hits about 2-4" lower IIRC at about 25'. I'm using 105 grain SWC though. I wasn't shooting from a rest either.

The above posters are right in that you can minimize it by what bullet weights you shoot.

 

[warnerwh]

Actually you need a heavier bullet to raise POI. Lighter faster bullets hit lower. This has to do with barrel time.

 

[Obturation]

The trouble is differences in bullet diameter VS bore dimensions too. A 357 blackhawk convertible has to accomdate bullets that are .356 & .358ish. The velocity , weight ect will effect it further. These things are made because they can be but aren't intended for bullseye shooting by any means, if a serious task is at hand a specific load should be selected that is accurate, consistant and that the sights are regulated for, all the rest are just for fun.

 

[PapaG]

Bullet weight is #1, velocity is #2. Example #1. Remington single action replica. Factory 255 grain 45 Colt, 12" above poa at 2 5 yards. Sequentially, 250, 230, 225, 200, 185, and finally 155 grains bullets worked it down to poa=poi. We decided on 200 and I killed th rear slot slightly deeper. #2. TC Contender. 38 hbwc @795 was sighted dead on at 25. 357 158 jhp @1400 was 6" low. Mix to match. It can be done.