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Cores from jacketed rounds will generally be very nearly pure lead (as mentioned above). Range lead will usually average around 8 or 9 bhn, but could be higher or lower depending on the percentage of .22s being shot compared to the bigger bores. If you get lots of magnum shooters, you might have your alloy actually be around 11 or 12 on average.
Most range officers won't let you anywhere near the berms during shooting times. I'd suggest talking with the range master and see if you could come in before or after shooting hours for some scrounging. Also, best time to find spent slugs on or near the surface is right after a good rainstorm. You will probably find most weight with least disruption to the berm at that time.
Other sources of lead include wheelweights, roof flashing, X-ray shielding, stained glass shops, and old printing shops. Or, you could purchase lead from others who have gathered it or from places like Rotometals (great place to do business with, reasonable pricing, and gun friendly).
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