Thread: Super light thinking

I cant shoot my bog standard Kimber Hunter 257R consistently well. I know it's capable. It's just hard to keep steady and tame. Im close to putting a heavier Tikka weight type barrel on it. Caliber to be decided. @Jaco is going to help me about that.

Originally Posted by akaroa1

I did read it
But a barrel sleeve of 7075 is only a stiffener
The underlying 4140 barrel while pencil thin can contain the full pressure unsupported

I have all the chamber and barrel wall thickness tables and max pressure on hand.
All the liners are calculated for safe use with those cartridges at their maximum pressure and all have been proof tested

alright sounds good :-)

I use the European Individual Proof Of Weapons data
It's has all the extractor slot chamber data for drillings rifle barrels in it

When you look at a drilling rifle barrel ( and this data ) you realize how paper thin they can be and still be accurate whith the two shotgun barrels to keep them stuff.

You can make a barrel stupidly light but at the expense of rigidity
A 7075 sleeve well fitted is extremely light and stiff.
It also conducts heat vastly better than carbon wrapping.
Carbon being very stiff and light but also a good insulator !

Originally Posted by akaroa1

I use the European Individual Proof Of Weapons data
It's has all the extractor slot chamber data for drillings rifle barrels in it

When you look at a drilling rifle barrel ( and this data ) you realize how paper thin they can be and still be accurate whith the two shotgun barrels to keep them stuff.

You can make a barrel stupidly light but at the expense of rigidity
A 7075 sleeve well fitted is extremely light and stiff.
It also conducts heat vastly better than carbon wrapping.
Carbon being very stiff and light but also a good insulator !

the barrel is comparatively lowly utilized compared to lugs though.

How do you ensure barrel and 7075 liner stay together and ensure a uniform tension/compression (which is likely to be necessary for precision) over the barrel? Heat shrink? press fit? (imagine both difficult to uniformly do over long lengths) -curiosity only

Originally Posted by Tahr

I cant shoot my bog standard Kimber Hunter 257R consistently well. I know it's capable. It's just hard to keep steady and tame. Im close to putting a heavier Tikka weight type barrel on it. Caliber to be decided. @Jaco is going to help me about that.

Yes that’s the compromise of lightweights. I had a model 7 .223 in the past that I struggled to shoot well consistently. Lightweight, and thin proportions made it a tough proposition for top accuracy. The two centrefires that I now own are 8.9lb and 9.12lb. They’re lovely to shoot, and am far more consistent with them. They’re still a touch heavy, I’d be happy with 8lb on the nose for the best of both worlds.

The main culprit for the weight on my two shooters is they both wear very robust FFP dial scopes- 26oz each

Originally Posted by Tahr

I cant shoot my bog standard Kimber Hunter 257R consistently well. I know it's capable. It's just hard to keep steady and tame. Im close to putting a heavier Tikka weight type barrel on it. Caliber to be decided. @Jaco is going to help me about that.

Maybe try a heavier suppressor before you go that route. I mean if you just want to try a new cartridge in that rifle go for it but I am confident that if you are running a dpt suppressor if you put just 2x stainless baffles in your suppressor it will make a world of difference to the shootability. Extra weight at the end of the barrel will settle it down a lot. I shoot a few kimbers and the ones in the heavier cartridges all run heavier suppressors. They are tack drivers.

You’re back to my point made earlier. If you can’t shoot your rifle well consistently because its super lightweight requires a technique that’s difficult to replicate in different field positions then your weighting the attributes incorrectly.

Adding heavy brakes and suppressors is not something that I would or can do here. Al well balanced sporter and scope in the low 3kg range is shoot able, and able to be carried in the hand when needed.


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