ACCUBONDS

[Vince]

Howdy folks.

I'm having trouble getting the 180 grain Accubonds to shoot in my rifle.

The best group was about 2.0" with a COAL of 3.55" and 75 Grains of RL22. The most accurate load in my rifle is the 180 grain BT with said 75.0 grains of RL 22 and that gives me a 0.7" three shot group with a COAL of 3.498". I'm at whit's end with the Accubonds.

This is for a .300 Win Mag and the 75 grain charge gives me too much pressure, as I have to beat the bolt open with a rubber mallet when using the Accubonds. I have some other powders on hand to try also. Any ideas would be appreciated.

Thank you in advance.

Vince

Edit To Add: (Powders On Hand)

RL 22
IMR 4350
H 4831
IMR 7828

The Tech as Nosler suggested IMR 4350. What say you all? I'm looking for the most accurate hunting load I can find but would like 1/2 MOA if possible. This is a Remington 700P in .300 Win Mag with a 26" Bull Barrel.

Edit for typo. 0.07" changed to 0.7"

 

[DrMike]

Seventy-five grains of RL22 should not be a hot charge. Your chamber may not meet SAAMI specs; a chamber cast would tell you this. It is possible that you are jamming the bullet into the lands, creating excessive pressure. Your OAL would, in fact, indicate that this is a possibility. The SAAMI specs call for an OAL of 3.340 inches, and you report using an OAL of 3.55 inches. Any of the powders you name should work with the 300 Win Mag. Alternatively, what brass are you using? According to QL, Remington brass will generate excessive pressure compared to Winchester brass at the same charge level. QL projects almost 10K psi higher pressure when using RP brass.

 

[JD338]

Vince,

I think Mike nailed it. How far off the lands are you?
75.0 grs of RL 22 js one of those special loads, shooting well under MOA in 3 different rifles for me and several others have experienced the same level of accuracy.

JD338

 

[Oldtrader3]

Sounds to me also as though COAL is too long for this chamber. It should be closer to 3.340.

 

[Vince]

Lands are at 3.558.
The BT's at 3.498 are fine but the Accubonds at 3.498 give me shotgun patterns.

 

[SJB358]

Vince, I seem to have to run AB's further from the lands to get consistent accuracy out of most of my rifles. I would seat .015 deeper and keep running them deeper till you get some sort of better accuracy. I agree with the others though, 75 grains of RL22 is a pretty common, known good load for most 300's.

 

[pre6422hornet]

Yup just like Scotty said. I also had trouble with AB's in my old .270. I couldn't get them to group like BT's or PT's. I played with the seating depth and found the sweet spot. 3/4 inch - 1/2 inch groups now.

 

[CatskillCrawler]

I too have found better results when the ABs are seated deep in three of my rifles. Give em some jump!

 

[Vince]

Thanks, I'll give it another go.
I found the Ballistic Tips to do better when loaded longer but maybe not so with the Accubonds.

 

[russ808]

My rifles also likes the jump with the A-bonds. But the B-tips like it close.
Russ

 

[Antelope_Sniper]

Vince, what are you getting out of those 180gr BT's, 3K, 3100?

At that velocity do you really need the bonded bullet?

The BT's give you sufficent mass, great accuracy, and half the cost.

I'd stick with the 180gr BT's.

 

[OU812]

I ran 75.5 with a 180 AccuBond in my 300 win mag seated at 3.330 and it shot under an inch all day long.

 

[hunting1]

I had a heck of a time as welland like has been said already, just start at 3.340 dont try to get the lands with Accubonds. I shoot 75 grains RL22 and 70 grains H1000 with mine.

 

[Vince]

OK.
I loaded up set of 3.325, 3.330, and 3.340 with 75 grains of RL 22. I'll see what that gives me. I spent a lot of time measuring bullets to reduce variation. The most variation I have is 0.002". I should've loaded a set at 3.335 too but I ran out of bullets.
I also loaded up some Ballistic Tips as I like shooting smaller groups and the Ballistic Tips do give me that. Ballistic Tips are loaded out to 3.500". The AccuBond loads sure look short when compared to the Ballistic Tips. I'm hoping to get the Accubonds to shoot and if I can that will be my "go to" bullet as I think it would fare better if I struck a shoulder or something.
Thank you for the help and I'll report back after next week after I get a chance to go shooting. The winds been too blustery to do much accuracy work with an unknown load lately. Also been hotter than I can stand.

 

[Oldtrader3]

The newest handloading data just published as an addendum for Nosler #7 gives a COAL of 3.320 inches for the 130 grain AccuBond bullet. I have been loading Partitions to 3.340 for many years with the 130 Partition and it shoots pretty accurately but new data says to put the COAL at 3.330 for the Partition 130 gr. I will have to try it with my 55 grains of IMR 4350 and BR-2 primer?

 

[ElmerThud]

I can't say if it's of any help, but I shoot .25-06Rem and found the sweet spot at .045" off the lands with the AccuBond bullet. For interest, I use IMR4831.
Unless I missed it...Vince the OP doesn't mention at what range he wants his MOA groups, so I presume 100yds.

The COL I use is longer than then the Nosler recommendation by a long way & the biggest problem I had was with concentricity. The runout on some cartridges was excessive. I didn't find that out until I borrowed a friends guage to check.
Finally I adopted a common technique to seat bullets, rotating the cartridge while seating the bullet...even using a competition seating die... and managed to bring the runout right down.

It took me a while to find this problem and sort it out, but the final results have been very worthwhile.
I'm also using a 'hot' load to ensure I have the MV I want. Cheers, ATB