Hunting Washington Forum

Equipment & Gear => Guns and Ammo => Topic started by: Fish4Fun on October 18, 2024, 05:05:49 PM

Title: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 05:05:49 PM: I have a question about hand loads for a .300 Win Mag.
My brother has a Browning Hells Canyon Speed in .300 Win Mag. The loads him and our friend made for the gun will shoot 3 shot single hole groups at 100 yards. They are seriously accurate at 100 At 300 yards they are now 6” - 7” HIGH above the bullseye. If you hold 7” low it puts them dead center bullseye.
So, what if any ideas does anyone have that is causing the bullet to keep climbing.
Sight in is 2” high at 100 yards and the bullet is hitting at 7” high at 300 yards.
What would cause the bullet to keep on gaining elevation the farther it travels
Could this just be a bad load recipe ????

They were loading H1000 powder with 180 bullet
Title: Re: .300 Win Mag load issues
Post by: Taco280AI on October 18, 2024, 05:17:19 PM: Bad shooting form? Bad scope? Are you dialing @ 300 or holding dead on?
Title: Re: .300 Win Mag load issues
Post by: jrebel on October 18, 2024, 05:17:51 PM: Are they grouping well??
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 05:19:25 PM: Dead on hold with no scope adjustment. Doesn’t matter who is behind the trigger the down range is always still climbing.
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 05:21:57 PM: Quote from: jrebel on October 18, 2024, 05:17:51 PM
Are they grouping well??

At 100 yards 3 shot groups are under 1/2”
At 300 yards 7” high and 2” groups

I want him to shoot some factory loads and see what the results are
Title: Re: .300 Win Mag load issues
Post by: 2MANY on October 18, 2024, 05:37:17 PM: Heat waves off the barrel?
Title: Re: .300 Win Mag load issues
Post by: jrebel on October 18, 2024, 05:42:01 PM: This defies gravity and doesn't make sense to me. There has to be a mechanical error in the gear or the shooter. If it continues to group sub MOA, I would say the load is solid. In most cases, he should be zeroed at 200 yards if he is a couple inches high at 100. This would put him 7 inches low at 300. My numbers are approximations based on velocity, but would be very close.

If it were the gun, I would expect the grouping would not be sub MOA. If were the scope, I would say he has a serious tracking issue if he is dialing. If it is the shooter, I would look at how he is shouldering the rifle, if the sling stud is hitting the bag on recoil, etc. Again, If it is him, I would expect his groups would open up and not be sub MOA.

What's it do at 200 yards??
Title: Re: .300 Win Mag load issues
Post by: crabcreekhunter on October 18, 2024, 05:49:29 PM: Shooting off a bipod on a hard surface and getting some “bounce”? I’ve had it mess with me quite a bit but usually not that consistent.
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 05:54:23 PM: Not sure where he is at 200 as we had target set dead on at 300. To me this is just mind boggling how it is shooting. We shot just last week before deer season, luckily from our elk stand the shots are under 200 yards and they are big critters for a target. Need to do some load testing after elk season to figure this mess out. My .300 Weatherby is money every year shooting Weatherby ammo. Shooting the weatherby I don’t mess with hand loads so this is all new to me.
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 06:00:31 PM: Quote from: crabcreekhunter on October 18, 2024, 05:49:29 PM
Shooting off a bipod on a hard surface and getting some “bounce”? I’ve had it mess with me quite a bit but usually not that consistent.

We have a shooting bench with a rest on it with sand bags under the stock at the butt. I shoot my Weatherby off the same setup and it is on the money. 3” high at 100 and dead on at 300. So the bench and table are not an issue

Just mind boggling that the load is still gaining elevation
Title: Re: .300 Win Mag load issues
Post by: Blacktail Sniper on October 18, 2024, 06:13:30 PM: Rezero at 300, then see what happens to placement at 100?
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 18, 2024, 06:16:05 PM: Quote from: Blacktail Sniper on October 18, 2024, 06:13:30 PM
Rezero at 300, then see what happens to placement at 100?

Good idea 👍
Title: Re: .300 Win Mag load issues
Post by: GWP on October 18, 2024, 08:36:20 PM: My first thought was tall scope mounts.
Title: Re: .300 Win Mag load issues
Post by: grundy53 on October 18, 2024, 08:41:17 PM: This has nothing to do with the load.

Sent from my SM-S901U using Tapatalk
Title: Re: .300 Win Mag load issues
Post by: Jpmiller on October 19, 2024, 06:39:23 AM: I’d imagine something is wonky with the scope? I’m not an expert or a gunsmith but that’s the only thing I can think of that would make sense and not be breaking physics.

Maybe you’ve got something you can market to the military or those extreme long range guys :chuckle:
Title: Re: .300 Win Mag load issues
Post by: Snakeriver on October 19, 2024, 08:15:24 AM: Zero it at 100. 2" inch group at 300 is barely above 1/2 moa which is what its shooting at 100.
Title: Re: .300 Win Mag load issues
Post by: Snakeriver on October 19, 2024, 08:26:04 AM: Zero'd at 100 you should be around 9 inches low at 300. Thats just a guess though as I dont have a 300 wm.
Title: Re: .300 Win Mag load issues
Post by: MeepDog on October 19, 2024, 11:06:16 AM: Do you have incredibly high scope rings? Maybe it's a case of catching it on the way up and then on the way down like a shotgun slug.
Title: Re: .300 Win Mag load issues
Post by: cooltimber on October 19, 2024, 11:39:30 AM: cheek weld ?
Title: Re: .300 Win Mag load issues
Post by: Mtnwalker on October 19, 2024, 12:47:37 PM: This is not a ring height issue unless your rings are 4 inches tall. My guess is:

Bad zero. Shoot a 7 shot group at 100 with no adjustments between shots. 3 shot groups aren’t sufficient when diagnosing issues

Loose component or scope failure.

Operator error.

:twocents:
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 19, 2024, 01:15:58 PM: Next time out I am going to have him shoot a factory load at the same distance as the hand loads. Compare one to the other side by side. I am now thinking a scope that is out of whack. He has the Leupold 4x14 CDS on there. After elk season, do more testing and then send back to Leupold for a tuneup

Thanks for all of your ideas, I have been scratching my head about this rifle.
Title: Re: .300 Win Mag load issues
Post by: Taco280AI on October 19, 2024, 01:21:13 PM: Whatever it is I'd find and fix it now if it's going to be used for hunting. If it's the scope, my guess, who says it won't mess up more?
Title: Re: .300 Win Mag load issues
Post by: Fish4Fun on October 19, 2024, 02:27:14 PM: Quote from: Taco280AI on October 19, 2024, 01:21:13 PM
Whatever it is I'd find and fix it now if it's going to be used for hunting. If it's the scope, my guess, who says it won't mess up more?

Not my rifle, if it was it would have been fixed long before now.
Title: Re: .300 Win Mag load issues
Post by: chukar58 on October 19, 2024, 05:21:19 PM: Have you ever been able to shoot a good group with this load at 300 yards? In theory the bullet should be dropping out at 300 yards, my suspect is bad mount or perhaps scope or action screw is not torqued and loose.