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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

pgcpty
.224 member

Reged: 08/10/05
Posts: 4
Loc: NSW AUSTRALIA

375H&H Handloads
21/10/05 06:10 PM

Hi Y'll

I've been experimenting with various projectiles in the weight range of 250gr to 350gr in my recently acquired mint condition CZ602, as follows.

Taipan 300gr RNFB x 80gr of AR2209 MV 2630 <1" groups
Sierra 250gr SPBT x 81gr of AR2209 MV 2710 2.5" groups
Speer 270gr SPBT x 80.5gr of AR2209 MV 2670 2.5"groups
Taipan 350gr RNFB x 78gr of AR2209 MV 2515 <1" groups
All groups shot at 100yds.

I'm finding that I can readily set the RNFB bullets .020 back from the lands and still maintain plenty of bullet seating depth in the case mouth giving good accuracy. However when the Boat Tails are set back .020 from the lands the case/bullet seating depth is between 0.1" and 0.15" (i.e. 300gr and 350gr respectively) which I won't load. Consequently when set back to give ~0.25" seating depth in the case, the accuracy blows out to >2 minutes of angle.

This is all about ogive shape and has lead me to conclude that 375 SPBT projectiles are unsuitable for the CZ602 due to the amount of free bore.

This is bit of a disappointment actually. I'm interested in feedback on the issue and any recommendations regarding a range flat based projectiles where adequate case seating depth is achieved with close set back from the lands.

My chamber measurements are (approx)
Case Base to neck 2.875"
Case base to lands 3.200"
Distance across the lands 0.367, (each land 0.004" high)

All input appreciated

Cheers........Peter

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Subject	Posted by	Posted on
375H&H Handloads	pgcpty	21/10/05 06:10 PM
Re: 375H&H Handloads	500Nitro	22/10/05 08:41 AM
Re: 375H&H Handloads	pgcpty	22/10/05 01:42 PM
Re: 375H&H Handloads	500Nitro	22/10/05 02:09 PM
Re: 375H&H Handloads	pgcpty	22/10/05 05:55 PM
Re: 375H&H Handloads	500Nitro	22/10/05 08:25 PM
Re: 375H&H Handloads	Bushie	24/10/05 10:33 PM
Re: 375H&H Handloads	ALAN_MCKENZIE	25/10/05 12:57 AM
Re: 375H&H Handloads	Ratel74	25/10/05 09:50 AM
Re: 375H&H Handloads	rgp	22/10/05 04:04 PM
Re: 375H&H Handloads	500Nitro	22/10/05 04:38 PM
Re: 375H&H Handloads	pgcpty	22/10/05 08:40 AM
Re: 375H&H Handloads	SAHUNT	22/10/05 04:50 PM
Re: 375H&H Handloads	DarylS	22/10/05 04:01 AM
Re: 375H&H Handloads	WyoJoe	22/10/05 07:39 AM
Re: 375H&H Handloads	SAHUNT	21/10/05 08:57 PM
Re: 375H&H Handloads	500Nitro	21/10/05 11:23 PM
Re: 375H&H Handloads	500Nitro	21/10/05 06:38 PM

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